10313121220 has 24 divisors (see below), whose sum is σ = 21672240408. Its totient is φ = 4122451200.

The previous prime is 10313121191. The next prime is 10313121223. The reversal of 10313121220 is 2212131301.

It can be written as a sum of positive squares in 4 ways, for example, as 3908000196 + 6405121024 = 62514^2 + 80032^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10313121194 and 10313121203.

It is not an unprimeable number, because it can be changed into a prime (10313121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144471 + ... + 203710.

It is an arithmetic number, because the mean of its divisors is an integer number (903010017).

Almost surely, 2^10313121220 is an apocalyptic number.

10313121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10313121220 is an abundant number, since it is smaller than the sum of its proper divisors (11359119188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10313121220 is a wasteful number, since it uses less digits than its factorization.

10313121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349671 (or 349669 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 10313121220 its reverse (2212131301), we get a palindrome (12525252521).

The spelling of 10313121220 in words is "ten billion, three hundred thirteen million, one hundred twenty-one thousand, two hundred twenty".